Robust coordinated downlink beamforming for multicell-cognitive radio networks

In this paper, we design downlink (DL) beamforming vectors for a multiuser multicell cognitive radio (CR) network with imperfect channel state information (CSI) at base stations (BS). Specifically, we consider deterministic error in both channel gain and channel covariance. Our objective is to minim...

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Bibliographic Details
Published in2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) pp. 719 - 723
Main Authors Ponukumati, Dhananjaya, Feifei Gao, Bode, Mathias, Li, James C. F., Ming Lei
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2013
Subjects
Array signal processing
Cognitive radio
Interference
Optimization
Robustness
Signal to noise ratio
Uncertainty
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ISSN2166-9570
DOI10.1109/PIMRC.2013.6666230

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Summary:In this paper, we design downlink (DL) beamforming vectors for a multiuser multicell cognitive radio (CR) network with imperfect channel state information (CSI) at base stations (BS). Specifically, we consider deterministic error in both channel gain and channel covariance. Our objective is to minimize the total DL transmit power subject to quality of service (QoS) constraints of each secondary user (SU) and primary user (PU). The optimization problems for both uncertainty models can be transformed into convex semidefinite programming (SDP) from the standard rank relaxation approach. Interestingly, numerical results show that the obtained solutions fulfill the rank constraint and are therefore exact.
ISSN:2166-9570
DOI:10.1109/PIMRC.2013.6666230